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How to cook beets 
Preheat the oven to 400ºf (204ºc). 
Prepare your baking sheet. 
Find a shallow baking sheet that is suitable for roasting your beets.
OPTIONS:
[1]. Covering the baking sheet with aluminum foil is not necessary to prevent the beets from sticking, but beet juice may leak out, and a lining could make cleaning up easier when all is said and done. Wrap the beets in aluminum foil.
[2]. It must be large enough to submerge the entire wok on its side, but not so large that you cannot get the beets out of the oven. The baking sheet should also have ventilation holes in it; you do not want them to be visible during the roasting process.
[3]. Place the beets in the baking sheet in whatever form you like. Roast the beets for 1 minute at 400ºf (19ºc).
[4]. Put a line of sugar-soaked sticks over the bottom of the pan, and spray with cooking spray. You may wish to add some extra store-bought beets if they look bitter.
[1].